?url_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Ajournal&rft.aulast=Daniels&rft.au=Daniels%2C+M&rft.aufirst=M&rft.date=1+November+2004&rft.atitle=Negative+regulation+of+Smad2+by+PIASy+is+required+for+proper+Xenopus+mesoderm+formation&rft.issn=1477-9129&rft.title=DEVELOPMENT&rft.volume=131&rft.issue=22&rft.pages=5613-5626&rft.genre=article